Combination lock



Dec. 28 1926.

K. T. LQKEN COMBINATION LOCK Filed Feb. 16, 1926 2 Sheets-Sheet 1 FLUX e 1 v V I s59 4 K. T. LOKEN COMBINATION LOCK Filed Feb. 16, 1926 2 Sheets-Shet 2 Dec. 28 1926.

0 O fl O 2a /6 25 O- Patented Dec. 28, 1926.

UNITED STATES PATENT OFFECE.

KNUD T. LOKEN, or Gn nDr'onKs, NORTH DAKOTA, Assrenoa-or ONE-HALF T EDDIE A. FLAD'LAND, or GRAND roiaizsyrron'rn DAKOTA.

COMBINATION LOCK.

Application filed February Thisinvention relates to combination locks and particularly to that character of lock in which a single locking bolt is prevented from being retracted by a plurality of tumblers, each of which must be turned to a predetermined position before the lock can be retracted by a knob.

A further object is to provide a construction of this character which is very simple, which may be cheaply made, and which has been found to be very effective in actual practice.

My invention is illustrated in the accompanying drawings wherein: I

Figure 1 is a face view of, a portion of a door with my lock applied thereto;

vFigure 2 is an edge elevation of a door and lock;

Figure 3 is a face view of section A, the tumblers being in section;

Figure 4 is a like View to Figure 3 but showing the bolts retracted.

Figure 5 is a perspective view of the inside face plate;

Figure 6 is a perspective view of one of the tumblers; I

Figure 7 is a longitudinal sectional view through one of the tumblers.

In these drawings it will be seen that the lock comprises a casing formed in two sections A and B, the section A being recessed at 10 to receive a bolt. The bolt body is designated 11 and is provided with a medially disposed somewhat elliptical aperture 12 and with the bolt proper 13 extending out through an aperture 14 in the edge face of the sect-ion A. The body portion of the bolt is formed with two laterally and rearwardly curved projections'or arms 15 hav ing pointed extremities. Rearward of the aperture 12, which aperture receives the eccentric on the knob which operatesthe bolt, are the lateral prolongations or arms 16 which are also laterally and rearwardly curved and terminate in pointed extremities, and the body 11 is also formed with a rearwardly extending arm 17 terminating in a pointed extremit Disposed through circular apertures 18 in the section A are a plurality of cylindrical tumblers 19, 20,; 21, 22, and 23, all of these tumblers being alike in construction and each tumble-r as-illustrated in Figure 6, coinprising a sectional shank formed intermediate its ends with an annular enlargedportion' 1c, 1926. Serial No. 88,666.

24, such enlarged portion being formed with ratchet teeth 25, and at a certain point in its periphery with a relatively deep recess 26. The five tumblers coac-t with the extremities of the five arms 15, 16 and 17 and when the tumblers are turned so that the recesses 26 are immediately behind the'extremities of the arms, the bolt 11 may be retracted, but when any one tumbler is turned sothat the corresponding arm of the bolt body cannot enter the recess 26, the bolt is prevented frombeing retracted, Therefore, in order to retract the bolt under the action of the actuating knob, as will be later described, it is necessary that the several tumblers shall be turned to predetermined positions to carry the recesses 26 of these several tumblers into alignment with the several arms on the bolt body. The end faces of the tumblers are provided with numerals as for-instance, 1, 2, 3, 4: and 5, these numeralsbeing disposed adjacent the periphery of the end faces or an index pointer may be used instead if desired, or 9 These numbers, letters letters may be used. or pointers coact with like lettters, numerals or pointers carried by the section B of the lock, this section being provided with apertures 27 through which the several tumblers project.

For the purpose of'holding the bolt 11 projected I provide aspring 28 mounted against one wall 29 of the recess 10, this spring being of such character that it is urged away from the shank or arm 17 of the bolt. When the free end of the spring is forced in, however, it engages in a notch 30 formed in the shank or arm 17 and inasmuch as this occurs when the body of the boltis projected it will obviously prevent the retraction of the bolt by means of the knob until this spring has beenforced away from the bolt. For the purpose of forcing the spring away from the bolt provide a keyhole 31 opening into the recess 32. Adjacent to the tumbler 23 and in the recess 10 is disposed a bell crank lev'er33 mountedupon a screw 40. One armo-f this bell crank-lever extends into the recess- '82 through the' wall 34: thereof and the bit of a key inserted through the "keyhole 31 and turned will act to'u-rg'e the arm 33 of the bell crank-lever in the direction of the arrows in Figure .3, and carrythe arm 36 toward the-forward end "ofthe This me ee extends bealt) neath the spring 28 and is provided with an outstanding lug 37 engaging behind this spring so that when this bell crank 33 is shifted in the direction of the arrows in Figure 3, the lug 37 will pull the free end of the spring 28 outward away from the arm 17.

Extending over the arm 17 and over the bell crank 33 is plate 38 held in place by screws 39 and 40, the screw 40 constituting a pivot pin for the bell crank lever 33 and the screw 89 merely acting to hold the other end of the plate 38 in place. The face of the section A is recessed to receive this plate 38 and the plate 38 extends across the arm 17 and holds this arm in place and holds the bolt from dislodgement.

The section A is apertured at 4:1 to re ceive the cylindrical shank 42 of the actuating knob. This shank also extends through the face plate or section B, and carrier upon the shank is a cam or eccentric which is' disposed within the somewhat elliptical opening 12 in the bolt. Obviously, theretore, when this knob is turned in one direction, assuming that the combination has been properly set, and the key operated to retract the spring 28, the bolt will be retracted, and when it is turned in the opposite direction the bolt will be projected. Spring pawls 44 are provided to coact with each of the tumblers 19, 20, 21, 22 and 23 and engage with the ratchet teeth 25 thereof so as to prevent reverse movement of the tumblers. In other words, the tumblers must always be turned in one direction.

The recess 10, it will be understood, conforms more or less to the shape of the bolt 11 and the tumblers, but is sutliciently longer than the length of the bolt to permit the projection and retraction thereof.

The section A is provided with a :tace plate having apertures 2'7, as before stated, for the passage of the shanks of the several tumblers and is held to the body in any suitable manner. The section B, as illustrated in Figure 5, simply consists of a flat plate having apertures for the passage of the tumblers, knob and allied parts, as will be later stated. The lock casing formed of the sections A and B with the interior lock mechanism, is disposed within a door C by recessing the door so that thelock casing is flush therewith, each face or" the door being, of course, recessed to receive the face plate 45. The lock casing is held in place by bolts 46 passing through the door casing and through the lock and through the sections A and B. The section B is provided with apertures 48 for the passage of the several tumblers and the knob, and having a keyhole 49 through which the key may be inserted.

A face plate 47 is provided having aper 1,612,:ssa

tures for the passage of the tumblers and. knob and carrying the same arrangement of radially arranged numerals as in Figure 1.

As illustrated in Figure 7, each one of the tumblers is formed in three sections, the middle section constituting the ratchet 25 having clutch teeth engaging the confronting ends of the opposite sections of the tumbler and a bolt 50 passes longitudinally through all of the sections, the bolt having a nut 51 on its inside so the t by slackening up on this bolt the sections can beturned relative to the ratchet to thereby change the combination. 7

The operation or" the lock will be plain from what has gone before. The lock cannot be retracted by means or" the knob 12 until all of the several tumblers have been turned to a predetermined position which will bring their several recesses 26 in a line with the extremities of the ns on the bolt 11. When this has been done, it the key be turned and the spring 28 drawn out of engagement with the arm 17, the bolt may be retracted by operating the knob. Tie

bolt may also be projected by simply turning the knob e2. Then, of course, the tumblers should be turned so as to throw out the combination. The combination may be changed by changing the positions of the several numerals, letters or indices on the opposite faces of the lock or changing the positions of the numerals on the extremities of the tumblers.

While I have illustrated certain details of construction and arrangement of parts which I have found to be particularly eifective in actual practice I do not wish to be limited thereto as it is obvious that many changes might be made therein without de parting from the spirit of the invention as defined in the appended cla'.

I claim 1. A combination lock comprising alock casing, a bolt mounted therein and having a rearwardly extending arm, a tumbler rotatably mounted in the casing, the tumbler being formed of a middle section having a recess and two end sect-ions, the end sections and the middle section being detach-ably engaged with each other to permit the end sections to be rotated relative to themiddle section to thereby change the combination, an end of the tumbler havin indicia thereon whereby the combination may be set, and

projecting rearwardly extended arm, a tumbler rotatably mounted within the casing and having at one point a recess adapted to receive the extremity of the arm to thereby permit the retraction of the bolt when the tumbler is turned to a predetermined position, a knob mounted in the casing and operatively engaging the bolt to cause itsretraction or projection, a pawl engaging the bolt to prevent its retraction after being projected, and key actuated means for causing the projection of the pawl into engagement with the bolt or the retraction of the pawl from said engagement.

3. In a combination lock, a lock casing, a bolt mounted therein for longitudinal movement and having a plurality of laterally and rearwardly extended arms, and having an opening, a plurality of tumblers, one for each arm, rotatably mounted in the lock casing, each tumbler having a recess adapted to be turned into alignment with the extremity of the corresponding arm to permit the retraction of the bolt, and each tumbler having a ratchet face, a spring for each tumbler engaging the ratchet face, a knob extending through the lock casing and having a cam mounted thereon and engaging in said opening in the bolt causing the projection or retraction of the bolt, face plates having openings therein through which the tumblers and knob project, and having dials concentric to said openings and by which the tumblers are manipulated, a detent mounted within the lock casing and coacting with the bolt, and key actuating means for urging said detent into engagement with the bolt to prevent its retraction or shifting said detent out of engagement with the bolt to permit its retraction.

l. A combination lock comprising a lock casing, a bolt mounted therein, the bolt hav ing a pluarlity of laterally and rearwardly extended arms, and the bolt having a medially disposed rearwardly extended arm, a plurality of tumblers rotatably mounted in the casin each tumbler having a recess to receive tl e extremity of the corresponding arm, a ratchet on each tumbler, a spring for each tumbler engaging the ratchet and acting to hold the tumbler in its adjusted position, a detent mounted in the casing engaging the medially dipsosed arm, the arm having a notch with which said detent engages to prevent the retraction of the bolt, key actuated means for shifting said detent out of such engagement, a knob having a shank passing through the lock casing and operatively engaging the bolt to cause its retraction or projection as the knob is turned in one direction or the other, and face plates for the lock casing having apertures through which the tumblers and the knob shank pass, each of the tumblers being provided with an index mark, and each of the face plates surrounding each aperture being provided with a dial with which the tumbler mark coacts.

5. A combination lock comprising a lock casing, a bolt mounted therein and having a. plurality of rearwardly extended arms, a plurality of tumblers rotatably mounted in the casing, each tumbler being formed of a middle section having a recess, and two end sections, the end sections and the middle section being detachably engaged with each other to permit the end sections to be rotated relative to the middle section to thereby change the combination, the ends of the tumblers having indicia thereon whereby the combination may be set, and face plates with which the extremities of the tumblers coact having radially disposed indicia with which the indicia on the ends of the tumblers are correlated, and means for retracting the bolt when all of said tumblers have been set with their recesses in alignment with the arms of the bolt.

In testimony whereof I hereunto affix my signature.

KNUD T. LOKEN. 

